Vibrating screen



De.- 21, 1948. A, w. UH MANN 2,456,791

VIBRATING SCREEN 5 Sheets-Sheet 1 Filed Sept. 10, 1945 INVENTOR 6 /f 33 1 ARTHUR w. LIP PMANN ATTORNEYS A. w. LIFPPMANN VIBRAT ING S GREEN Dec. 21, 1948.

3 Sheets-Sheet 3 Filed Sept. 10, 1945 INVENTOR ARTHUR W.L|PPMANN ATTORNEYS Patented Dec. 21, 1948 2,456,791 VIBRATING SCREEN Milwaukee, Wis, assignor eering; Works, Milwaukee,

Arthur VJ. Lippmann,

to Lippmann Engin Wis.

Application September 10, 1945, Serial No'. 615,252

1' Claim.

This invention appertains broadly to vibrating screens of the character used for screening and grading various types of materials.

One of the primary objects of my invention is to provide a novel stabilizing device between the vibrating screen body and the stationary base frame whereby to efiectively maintain or modify the motion imparted to the screen body by an eccentric shaft.

Another salient object of my invention. is to provide a vibrating screen embodying a stationary base frame and a positively driven eccentric shaft on which is supported, substantially intermediate its ends, the screen body with one or more stabilizing devices for connecting the ends of the screen body with the base frame.

A further important obect of my invention is to provide a stabilizing device for vibrating screens embodying arms attached at their outer ends to the opposite ends of the screen body and other arms attached at their outer ends to the. opposite ends of the base frame with a floating, longitudinally extending rod connecting the inner ends of the adjacent arms together and thereby effectively uniting the ends of the screen body to the base frame for controlling the path of movement of the screen body.

A still further object of my invention is to have the distances between the points of attachment of the arms on the vibrating body, base frame, and

bar all equal; and to make the arms all' of equal length and thereby having the points of attachment of the four arms lay at the corners of two adjacent parallelograms whereby the motion imparted. by the eccentric shaft of the vibrating body will be maintained uniformly over the entire screen body.

With these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, aswill be hereinafter more specifically described, claimed, and illustrated in the accompanying. drawings, in which drawings:

Figure l is a side elevational view of a-vibrating screen showing one form of my novel stabilizing device incorporated therewith.

Figure 2 is a top plan view of my novel screen.

Figure 3 is an enlarged fragmentary central transverse sectional view through the screen taken substantially on the line 3-3 of Figure 1, looking in the directionof. the arrows.

' employed for. connecting the arms with the Figure 4 is an enlarged fragmentary detailv transverse sectional view taken substantially on.

the line.-4-4 of Figure 1, looking in the. direction of. the arrows, illustrating one form of. means.

screen body and the base frame.

Figure 5 is an enlarged fragmentary detail longitudinal sectional view taken substantially on the line 5-5 of Figure 4, looking in the direction of the arrows, illustrating one preferred type of means for connecting the arms to the screen body and the base frame and to the floating bar at one end.

Figure 6 is an enlarged detail sectional view taken substantially-on the line 6-5 of Figure 3, looking in the direction of the arrows, illustrating: a part of the eccentric drive, and

Figure '7 is a detail fragmentary side elevational view illustrating the means for connecting the arms at one end to the opposite end of the bar from that shown in Figure 5.

Figure 8 is a side elevational View of a vibrating screen showing another from of my novel stabilizing device incorporated therewith.

Figure 9 is an enlarged detail sectional view taken substantially on the line 9--9 of Figure 10 looking. in the direction of the arrows, showing the. connection of the floating rod at one end with the pivoted rigid links.

Figure 10 is an enlarged fragmentary transverse sectional view taken on the line lll-l ii of Figure 9 looking in the direction of the arrows, and

Figure 11 is an enlarged fragmentary detail longitudinal sectional view taken on the line ll-H of Figure 9', looking in the direction of the arrows.

Referring to the drawings in detail, wherein similar reference characters designate corresponding parts'throughout the several views, the letter S generally indicates my vibrating screen and the same includes a stationary base frame it, a vibrating screen body 20, an eccentric drive Ell for supporting and actuating the screen body 20 and a stabilizing device 35 for connecting the vibrating body 20 with the base frame it).

The base frame If] is preferably arranged at a desired angle and can be constructed in any desired.v way and from any preferred materials. As illustrated, the same includes a pair of spaced parallel side channel beams ll and l2, the opposite ends of which are rigidly connected by end channel: beams l3 and. M. The base frame can be supported in any preferred way, such as by columns l5 at' one end and a stop angle iron at the opposite: end. The upper faces of the side beams II and I2 have rigidly bolted, welded, or otherwise secured thereto, adjacent their ope posite. ends, upstanding brackets l1 and it. for a Each. of the.

brackets have smooth inner faces l9, all of which are arranged parallel with one another.

The vibrating screen body 20 can also be constructed in any preferred or desired way and, as illustrated, includes a pair of spaced parallel longitudinally extending side plates 2| and 22. These plates have formed, on their lower edges, inturned flanges 23 on which can rest the screen deck 24 of the desired mesh. Obviously, any number of decks can be carried by the screen body. The longitudinal edges of the screen deck can be held in place by means of longitudinally extending clamping plates 25, and these clamping plates are adjustably held in place by means of bolts 26.

The screen body 29 is of a less width than the base frame Ill, but extends substantially the full length of the base frame and substantially parallel therewith.

The eccentric drive 3!) includes a transversely extending shaft journaled at its opposite ends in bearings 32 rigidly bolted to the upper ends of the longitudinally extending beams H and I2.

Formed on or secured to the shaft 3! are eccentrics 33, mounted in eccentric bearings 34, bolted or otherwise rigidly fastened to the lower faces of the side plates 2i and 22 of the vibrating screen body 20. The shaft 3! is driven in any preferred manner and includes other features and parts not essential to the operation of this device.

My novel stabilizing device 35 is constructed and arranged in such a manner as to bring about the connection of the vibrating screen body 2i! with the base frame it so that controlled desired movement will be obtained for the screen body. A stabilizing device can be used on each side of the screen and, in fact, such is preferred and shown in the drawings. However, as the two stabilizing devices are of exactly the same construction, only one will be described in detail.

My stabilizing device 35 includes two upper arms 33 and 37 located adjacent to the opposite ends of the screen body and two lower arms 38 and 39 located adjacent to the opposite ends of the stationary base frame Ill. The outer or upper ends of the arms 36 and united to the screen body 20 adjacent to its opposite ends and its upper face. One preferred means of connecting the upper arms 35 and 37 with the vibrating body includes brackets 48 and ll which are firmly bolted or otherwise secured to the screen body. Each of these brackets include an attaching face plate i2 and a V-shaped supporting block 43. A clamp head 44 is provided for each block. Machine screws 45 are utilized for adjustably conecting the clamp heads with the blocks for gripping the upper ends of the arms 3t and 37 therebetween.

The lower pair of arms 38 and 39 have their lower or outer ends firmly connected with the supporting brackets I? and 58 by means of attaching plates 46. These plates 46 have formed thereon inwardly extending V-shaped supporting blocks 4'! and clamp heads 48 are adjustably connected to the b ocks by means of machine screws @9 so that said outer ends of the arms 33 and 39 can be firmly held.

The inner ends of the arms 36, 37, 3'8 and 39 are connected by a longitudinally extending fioat ing bar The opposite ends of the floating bar have formed thereon or secured thereto heads 5! and 52, and these heads are shaped in such a manner as to effectively support and hold the inner ends of the arms.

It is to be noted that the head 5| is shaped to receive the arms and a clamp plate 53 is utilized for securing the inner ends of the arms 36 and 38 in place. The head 52 is shaped similar to the head 5| with the exception that the same is depressed to receive the inner ends of the arms 31 and 39. A clamp plate 54 is utilized to hold the inner ends of the arms in the depressed portion of this head.

As clearly illustrated in Figure 1, the distances between the points of attachment of the arms on the vibrating body 25, a base frame It and bar 50, are all equal and the length of the arms all equal so that the points of attachment of the four arms lay at the corners of two adjacent parallelograms. By this construction, the motion imparted to the screen body by the eccentric shaft is maintained uniformly over the entire screen body. Obviously, by varying the length of the arms, the motion of the screen body can be modified to suit various screening operations.

Where the arms are formed from resilient material and function as springs, the inner ends of the arms can be joined together as an integral unit, as is clearly shown in the drawings, or the arms can be formed in separate pieces with their ends arranged in over-lapping clamped relation. In all events, the arms 36 and 38 and the arms 37 and 39, when united to the floating bar 50, are of a substantially V shape when viewed in side elevation.

If preferred, the arms can be made of rigid material and in the nature of pivoted links. This form of my invention has been illustrated in Figures 8 to H, inclusive. In such figures, the vibrating screen is indicated generally by the letter V and the same includes the inclined stationary base frame 55, and a vibrating screen body 56. An eccentric drive 5'! is employed for supporting and vibrating the screen body 56. The ends of the vibrating screen body 56 and the frame 55 are joined by the stabilizing device 58. In this form of my invention, the stabilizing de vice 58 includes the longitudinally extending floating rod 59 and the same has pivotally connected to its oppositeends, by means of a pivot pin 60, an upper link 5! and a lower link 32. The upper link 6! has its outer end pivotally connected, by means of a pivot pin 63, to a bracket 64, bolted or otherwise secured, as at '65, to the vibrating screen body 55. The outer end of the lower link 62 is connected to a bracket 55 by means of a pivot pin 51 to the base frame 55.

As is clearly shown in Figures 10 and H, the inner end of the upper link 6| has formed thereon a yoke 68 which straddles the inner end of the lower lever 62. The inner ends of the levers or links 6| and 62 are received in a bifurcated head 69 which is welded or otherwise fastened to the adjacent end of the floating rod 59. The link arrangement at the opposite ends of the rod is substantially the same and it is to be noted that all of the links or levers are of the same length. However, th lengths of the levers can be changed to suit varying conditions.

Changes in details may be made without departing from the spirit or the scope of my invention, but what I claim as new is:

A. vibrating screen comprising a base frame, a power driven eccentric shaft journaled on said screen body supported substantially entirely upon said eccentric shaft and actuated thereby, and a stabilizing device for connecting the ends of the screen body with the ends of the base frame including a longitudinally extending floating bar, upstanding brackets secured to the base frame having supporting blocks, brackets secured to the screen body having supporting blocks, substantially V-shaped leaf springs having their opposite ends secured to the blocks and means clamping the bight portions of the springs to the terminals of the bar each of the bight portions extending toward the same end of the screen.

ARTHUR W. LIPPMANN.

REFERENCES CITED The following references are of record in the file of this patent:

Number 10 Number 6 UNITED STATES PATENTS Name Date Toepfer Sept. 8, 1936 Ferriss Aug. 31, 193'? Denovan Oct. 17, 1939 Gary Dec 17, 1940 FOREIGN PATENTS Country Date France Aug. 11, 1913 Germany May 27, 1940 

